Q: My cat converter has 2 oxygen sensors?

asked by on

Does my cat have 2 oxygen sensors?

My car has 123275 miles.
My car has an automatic transmission.

Hi there. The modern emissions system requires the use of at least (2) different O2 sensors. The upstream O2 sensor is designed to detect the amount of NoX coming out of your engine and adjusts your fuel/air ratio to correct and your downstream O2 sensor is located next to your catalytic converter to make sure the cat is doing its job.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. My cat converter has 2 oxygen sensors?

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I was stopped on the freeway, started to go about 5 mph, the car jerked and stop without warning like the wheels locked up.

Hi, thanks for writing in. I'd be happy to try to help. It is hard to definitively diagnose what the issue is. At first it seems like a transmission issue. Automatic transmissions are rather complicated and can do strange things...

Q: MY truck check engine light came on flashing for about a min then went away. Now my truck is at 107,234 miles and spark plugs wher

A flashing check engine light normally does indicate a misfire on one or more cylinders. However checking the trouble codes is the only way to know for sure. Faulty spark plugs are a common cause of misfires. Since the spark...

Q: Rear light band

Unfortunately, the rear light strip on the trunk is an LED and the whole assembly will need to be replaced if it fails. You may want to enlist the help of a mechanic, such as one from YourMechanic, to replace...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.